Vehicle mounted hoist

Claim 1

IN COMBINATION WITH THE LOAD-RECEIVING BED OF A WHEELED VEHICLE, A UNITARY SWING-FRAME FORMED TO A YOKE SHAPE SO AS TO PROVIDE UPRIGHT SIDE ARMS CONNECTED ACROSS THE TOP BY A BRIDGE HAVING A LENGTH APPROXIMATELY THE SAME AS THAT OF THE BED AND AT THE LOWER ENDS OF SAID SIDE ARMS PRESENTING INTURNED CO-AXIAL TRUNNIONS RECEIVED FOR ROCKER MOTION IN ROTARY JOURNALS PROVIDED BY THE BED ON THE APPROXIMATE LONGITUDINAL MEDIAN LINE THEREOF, ONE AT THE FRONT AND THE OTHER AT THE REAR OF THE BED, FOR SWING MOVEMENT OF THE BRIDGE ABOUT THE CENTER OF SAID TRUNNIONS AS AN AXIS FROM A NORMAL POSITION OVERLYING THE AXIS INTO A POSITION LYING OUTBOARD OF THE BED AT EITHER SIDE THEREOF, SELECTIVELY, A WINCH HOIST CARRIED BY SAID BRIDGE OF THE SWING-FRAME, AND POWER OPERATED MEANS FOR MOVING SAID SWING-FRAME IN ITS SAID SWING MOVEMENT, MEANS BEING PROVIDED PERMITTING SAID WINCH HOIST TO BE SHIFTED AT WILL TO ANY SELECTED POINT WITHIN THE END LIMITS OF THE BRIDGE, THE FRONT SIDE ARM OF SAID SWING-FRAME LYING BEYOND THE FRONT END LIMIT OF THE BED AND THE REAR SIDE ARM OF SAID SWING-FRAME LYING BEYOND THE REAR END LIMIT OF THE BED SO THAT LOADS PICKED UP BY THE WINCH HOIST MAY BE FREELY SWUNG BY SAID SWING-FRAME TO AND FROM THE BED AT ANY POINT BETWEEN THE EXTREME FORE-AND-AFT END LIMITS OF THE BED.